This is getting more odd by the second. Since it sounds sincere. Much like Lilah Morgan did when she said, "Sure, we're glad to help"... and then called her thugs to drag him to vivisection. Still, if neither Harry or Lex had said anything about Lionel, he'd probably have thought the man meant just what he said, because really, what other reason could he have?

It occurs to Connor that Luthor Senior could have heard about Bruce Wayne de facto taking over OsCorp management and wanted to talk about that, but then again, Harry said Lionel wasn't managing LuthorCorp anymore, Lex was, so that couldn't be the reason.

"Connor Riley," he says, still smiling, stretching out his hand. Lionel has a firm grip, and a pulse, which means he will get invited in. (It's something so deeply trained into Connor he does it on instict: never, ever, invite strangers into your home unless you're sure they're not vampires. Never mind knowing them, always check whether they're still human first.) "That's really nice of you, Mr. Luthor, but Harry's not here right now. Come in, though, you can leave a message, plus since you've come all the way from Metropolis, you must be thirsty."

This would be Connor trying to apply social observations from hanging around Harry, as well as plain old manners which fake memories have taught him. He has them, you know. And he has something to prove here as well.